I found an article in the german computer magazine c't today about sage (c't 5/2011 p. 69) where it says:
"Das Gratis-Paket Sage bringt die wichtigesten Open-Source-Mathematikprogramme schon mit - 'Batteries included', heißt es in der ausführlichen, aber komplett englischen Dokumentation. ..."
(The free package Sage brings the most important open-source math-programs batteries included, as it says in the detailed, but completely english written documentation.)

Maybe we should use that as a reminder that we already have a german version of the tut here.